“Smart” Base Isolation Strategies Employing Magnetorheological Dampers
Publication: Journal of Engineering Mechanics
Volume 128, Issue 5
Abstract
One of the most successful means of protecting structures against severe seismic events is base isolation. However, optimal design of base isolation systems depends on the magnitude of the design level earthquake that is considered. The features of an isolation system designed for an El Centro-type earthquake typically will not be optimal for a Northridge-type earthquake and vice versa. To be effective during a wide range of seismic events, an isolation system must be adaptable. To demonstrate the efficacy of recently proposed “smart” base isolation paradigms, this paper presents the results of an experimental study of a particular adaptable, or smart, base isolation system that employs magnetorheological (MR) dampers. The experimental structure, constructed and tested at the Structural Dynamics and Control/Earthquake Engineering Laboratory at the Univ. of Notre Dame, is a base-isolated two-degree-of-freedom building model subjected to simulated ground motion. A sponge-type MR damper is installed between the base and the ground to provide controllable damping for the system. The effectiveness of the proposed smart base isolation system is demonstrated for both far-field and near-field earthquake excitations.
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References
Coleman, T., Branch, M. A., and Grace, A. (1999). Optimization toolbox user’s guide, The MathWorks, Inc.,
Dyke, S. J., Spencer, B. F., Jr., Sain, M. K., and Carlson, J. D.(1996). “Modeling and control of magnetorheological dampers for seismic response reduction.” Smart Mater. Struct., 5, 565–575.
Dyke, S. J., and Spencer, B. F., Jr., (1997). “A comparison of semi-active control strategies for the MR damper.” Proc., IASTED Int. Conf., Intelligent Information Systems, The Bahamas.
Feng, M. Q., Shinozuka, M., and Fujii, S., (1993). “Friction-controllable sliding isolated system.” J. Eng. Mech., 119(9), 1845–1864.
Furuhashi, T., et al. (1998). “Study on micro-vibration of base isolated semiconductor factory close to Shinkansen.” Proc., Meetings of the Architectural Institute of Japan, 711–718 (in Japanese).
Gavin, H. P.(2001). “Control of seismically-excited vibration using electrorheological materials and Lyapunov methods.” IEEE Trans. Autom. Control, 9(1), 27–36.
Gavin, H. P., Hanson, R. D., and Filisko, F. E.(1996). “Electrorheological dampers part I: Analysis and design.” J. Appl. Mech., 63, 669–675.
Hall, J. F., Heaton, T. H., Halling, M. W., and Wald, D. J.(1995). “Near-source ground motion and its effects on flexible buildings.” Earthquake Spectra, 11(4), 569–605.
Heaton, T. H., Hall, J. F., Wald, D. J., and Halling, M. W.(1995). “Response of high-rise and base-isolated buildings in a hypothetical Mw 7.0 blind thrust earthquake.” Science, 267, 206–211.
Inaudi, J. A., and Kelly, J. M. (1990). “Active isolation.” U.S. National Workshop on Structural Control Research, Los Angeles, 125–130.
Inaudi, J. A., and Kelly, J. M.(1993). “Hybrid isolation systems for equipment protection.” Earthquake Eng. Struct. Dyn., 22, 297–313.
International Conference of Building Officials. (1997). “Uniform building code.” Earthquake regulations for seismic-isolated structures, 2, Appendix, Chap. 16, Whittier, Calif.
Johnson, E. A., Ramallo, J. C., Spencer, B. F., Jr., and Sain, M. K. (1999). “Intelligent base isolation systems.” Proc., 2nd World Conf. on Structural Control, Kyoto, Japan, 367–376.
Kelly, J. M., Leitmann, G., and Soldatos, A. G.(1987). “Robust control of base-isolated structures under earthquake excitation.” J. Opt., 53(2), 159–181.
Madden, G. J., Symans, M. D., and Wongprasert, N. (2000). “Adaptive seismic isolation systems for structures subjected to disparate earthquake ground motions.” 14th Analysis & Computational Specialty Conf. Proc., 2000 Structures Congress & Exposition, Philadelphia.
Makris, N.(1997). “Rigidity-plasticity-viscosity: Can electrorheological dampers protect base-isolated structures from near-source ground motions?” Earthquake Eng. Struct. Dyn., 26, 571–591.
Naeim, F., and Kelly, J. M. (1999). Design of seismic isolated structures: From theory to practice, Wiley, Chichester, England.
Nagarajaiah, S., Riley, M. A., and Reinhorn, A.(1993). “Control of sliding-isolated bridge with absolute acceleration feedback.” J. Eng. Mech., 119(11), 2317–2332.
Nagarajaiah, S., Sahasrabudhe, S., and Iyer, R. (2000). “Seismic response of sliding isolated bridges with smart dampers subjected to near source ground motions.” 14th Analysis & Computational Specialty Conf. Proc., 2000 Structures Congress & Exposition, Philadelphia.
Nishimura, H., and Kojima, A. (1998). “Robust vibration isolation control for a seismically excited building.” Proc., 2nd World Conf. on Structural Control, Kyoto, Japan, 2, 1399–1406.
Quast, P., Sain, M. K., Spencer, B. F., Jr., and Dyke, S. J.(1995). “Microcomputer implementations of digital control strategies for structural response reduction.” Microcomputers in civil engineering: special issue on new directions in computer aided structural system analysis,Design Opt., 10, 13–25.
Ramallo, J. C., Johnson, E. A., Spencer, B. F., Jr., and Sain, M. K. (2000a). “ ‘Smart’ base isolation systems.” Proc., Advanced Technology in Structural Engineering, Structures Congress, Philadelphia.
Ramallo, J. C., Johnson, E. A., and Spencer, B. F., Jr. (2000b). “ ‘Smart’ base isolation systems.” 14th Analysis and Computational Specialty Conf. Proc., 2000 Structures Congress & Exposition, Philadelphia.
Sahasrabudhe, S., Nagarajaiah, S., and Hard, C. (2000). “Experimental study of sliding isolated buildings with smart dampers subjected to near source ground motions.” Proc., 14th Engineering Mechanics Conf., Austin, Tex.
Skinner, R. I., Robinson, W. H., and McVerry, G. H. (1993). An introduction to seismic isolation, Wiley, Chichester, England.
Spencer, B. F., Jr., Dyke, S. J., Sain, M. K., and Carlson, J. D.(1997). “Phenomenological model of a magnetorheological damper.” J. Eng. Mech., 123(3), 230–238.
Spencer, B. F., Jr., Johnson, E. A., and Ramallo, J. C.(2000). “ ‘Smart’ isolation for seismic control.” JSME Int. J. Ser. C: Special Issue on Frontiers of Motion and Vibration Control, 43(3), 704–711.
Symans, M. D., and Kelly, S. W.(1999). “Fuzzy logic control of bridge structures using intelligent semi-active seismic isolation systems.” Earthquake Eng. Struct. Dyn., 28(1), 37–60.
Szucs, E. (1980). Fundamental studies in engineering Vol. 2: Similitude and modeling, Elsevier Scientific, Amsterdam.
Yang, J. N., et al. (1995). “Hybrid control of seismically excited bridge structures.” Earthquake Eng. Struct. Dyn., 24(11), 1437–1451.
Yang, J. N., et al. (1996). “Control of sliding-isolated buildings using sliding-mode control.” J. Struct. Eng., 122(2), 179–186.
Yang, J. N., and Agrawal, A. K. (2001). “Semi-active hybrid control systems for nonlinear buildings against near-field earthquakes.” Eng. Struct., in press.
Yoshida, K., Yoshida, S., and Takeda, Y. (1999). “Semi-active control of base isolation using feedforward information of disturbance.” Proc., 2nd World Conf. on Structural Control, Kyoto, Japan, 1, 377–386.
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Published In
Journal of Engineering Mechanics
Volume 128 • Issue 5 • May 2002
Pages: 540 - 551
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Dec 13, 2000
Accepted: Sep 13, 2001
Published online: Apr 15, 2002
Published in print: May 2002
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